Low complexity design of primary synchronization sequence for OFDMA

Abstract

The present disclosure provides a base station transmitter, a user equipment receiver and methods of operating a base station transmitter and a user equipment receiver. In one embodiment, the base station transmitter is for use with a cellular communication system and includes a scheduling unit configured to provide a primary synchronization sequence that is distinguishable from other primary synchronization sequences employed by adjacent base station transmitters located in contiguous communication cells, wherein a primary synchronization sequence structure is based on a reduced computational complexity for identification of the primary synchronization sequence in a user equipment receiver. Additionally, the base station transmitter also includes a transmit unit configured to transmit a primary synchronization signal corresponding to the primary synchronization sequence.

1. A base station transmitter for use with a cellular communication system, comprising:
 a scheduling unit configured to provide a primary synchronization sequence that is distinguishable from other primary synchronization sequences employed by adjacent base station transmitters located in contiguous communication cells, wherein the primary synchronization sequences are based on Zadoff-Chu sequences where the summation of two root indices equals a sequence length parameter; and 
 a transmit unit configured to transmit a primary synchronization signal corresponding to the primary synchronization sequence. 
 
     
     
       2. The transmitter as recited in  claim 1  wherein the primary synchronization sequence structure is provided in the frequency-domain or the time-domain for transmission. 
     
     
       3. The transmitter as recited in  claim 1  wherein the primary synchronization sequence and the other primary synchronization sequences employs a total of three different primary synchronization sequences. 
     
     
       4. The transmitter as recited in  claim 1  wherein the primary synchronization sequence and the other primary synchronization sequences are configured to provide first and second sequence portions thin are mirror images of each other around a center position in the frequency domain. 
     
     
       5. The transmitter as recited in  claim 1  wherein two of the root indices are  29  and  34 , respectively. 
     
     
       6. The transmitter as recited in  claim 1  wherein two or the primary synchronization sequences have a complex conjugate relationship in the time-domain. 
     
     
       7. The transmitter as recited in  claim 1  wherein the primary synchronization signal and other primary synchronization signals are transmitted concurrently. 
     
     
       8. The transmitter as recited in  claim 1  wherein the primary synchronization sequence and the other primary synchronization sequences comply with an OFDMA specification. 
     
     
       9. A method of operating a base station transmitter for use with a cellular communication system, comprising:
 providing a primary synchronization sequence that is distinguishable from other primary synchronization sequences employed by adjacent base station transmitters located in contiguous communication cells, wherein the primary synchronization sequences are based on Zadoff-Chu sequences where the summation of two root indices equals a sequence length parameter; and 
 transmitting a primary synchronization signal corresponding to the primary synchronization sequence. 
 
     
     
       10. The transmitter as recited in  claim 9  wherein the primary synchronization sequence structure is provided in the frequency-domain or the time-domain for transmission. 
     
     
       11. The method as recited in  claim 9  wherein the primary synchronization sequence and the other primary synchronization sequences employ a total of three different primary synchronization sequences. 
     
     
       12. The method as recited in  claim 9  wherein the primary synchronization sequence and the other primary synchronization sequences provide first and second sequence portions that are mirror images of each other around a center position in the frequency domain. 
     
     
       13. The method as recited in  claim 9  wherein two of the root indices are  20  and  34 , respectively. 
     
     
       14. The method as recited in  claim 9  wherein two of the primary synchronization sequences have a complex conjugate relationship in the time-domain. 
     
     
       15. The method as recited in  claim 9  wherein the primary synchronization signal and other primary synchronization signals are transmitted concurrently. 
     
     
       16. The method as recited in  claim 9  wherein the primary synchronization sequence and the other primary synchronization sequences comply with an OFDMA specification. 
     
     
       17. A user equipment receiver for use with a cellular communication system, comprising:
 a processing unit configured to process a plurality of distinguishable primary synchronization signals transmitted by base station transmitters located in contiguous communication cells, wherein the primary synchronization sequences are based on Zadoff-Chu sequences where the summation of two root indices equals a sequence length parameter; and 
 a detection unit configured to identify one of the plurality of different primary synchronization signals corresponding to a communication cell serving the user equipment receiver. 
 
     
     
       18. The receiver as recited in  claim 17  wherein the primary synchronization sequence structure is provided in the frequency-domain or the time-domain for reception. 
     
     
       19. The receiver as recited in  claim 17  wherein the plurality of different primary synchronization sequences employs a total of three different primary synchronization sequences. 
     
     
       20. The receiver as recited in  claim 17  wherein the plurality of different primary synchronization sequences is configured to provide first and second sequence portions that are mirror images of each other around a center position in the frequency domain. 
     
     
       21. The receiver as recited in  claim 17  wherein two of the root indices are  29  and  34 , respectively. 
     
     
       22. The receiver as recited in  claim 17  wherein two of the primary synchronization sequences have a complex conjugate relationship in the time-domain. 
     
     
       23. The receiver as recited in  claim 17  wherein the plurality of different primary synchronization sequences is transmitted concurrently. 
     
     
       24. The receiver as recited in  claim 17  wherein the plurality of different primary synchronization sequences complies with an OFDMA specification. 
     
     
       25. A method of operating a user equipment receiver for use with a cellular communication system, comprising:
 processing a plurality of distinguishable primary synchronization sequences that are transmitted by base station transmitters located in contiguous communication cells, wherein the primary synchronization sequences are based on Zadoff-Chu sequences where the summation of two root indices equals a sequence length parameter; and 
 identifying one of a plurality of distinguishable primary synchronization signals corresponding to a communication cell location of the user equipment receiver. 
 
     
     
       26. The method as recited in  claim 25  wherein the primary synchronization sequence structure is provided in the frequency-domain or the time-domain for reception. 
     
     
       27. The method as recited in  claim 25  wherein the plurality of distinguishable primary synchronization sequences employ a total of three different primary synchronization sequences. 
     
     
       28. The method as recited in  claim 25  wherein the plurality of distinguishable primary synchronization sequences provide first and second sequence portions that are mirror images of each other around a center position in the frequency domain. 
     
     
       29. The method as recited in  claim 25  wherein two of the root indices are  29  and  34 , respectively. 
     
     
       30. The method as recited in  claim 25  wherein two of the primary synchronization sequences have a complex conjugate relationship in the time-domain. 
     
     
       31. The method as recited in  claim 25  wherein the plurality of distinguishable primary synchronization sequences is received concurrently. 
     
     
       32. The method as recited in  claim 25  wherein the plurality of distinguishable primary synchronization sequences complies with an OFDMA specification.